#left-menu
{
    color: #bbc7ce;
}
#left-menu a
{
    color: #bbc7ce;
}
/*一级菜单div的类样式*/
.level1-menu
{
    height: 40px;
    display: flex;
    padding: 10px 15px;
}
.level1-menu:hover
{
    background-color: #18252b;
    color: white;
}
.level1-menu span:nth-child(1)
{
    flex: 1;
    text-align: center;
}
.level1-menu span:nth-child(2)
{
    flex: 6;
}
.level1-menu span:nth-child(3)
{
    flex: 1;
    text-align: center;
}

/*二级菜单div的类样式*/
.level2-menu
{
    display: flex;
    flex-direction: column;
}
.level2-menu a
{
    height: 40px;
    line-height: 40px;
    padding-left: 50px;
}
.level2-menu a:hover
{
    color: white;
    text-decoration: none;
    background-color: #18252b;

}
.level2-menu a:hover span
{
    color: white;
}
.level2-menu span:nth-child(1)
{
    margin-left: 10px;
}